. >>> today's question comes from christy johnson. how do you book guests, keep them from fighting before the shows begin, decide timing and content. >> we looked for well informed insightful analysts. from this green room surveillance cam, everyone gets along just fine before the red light comes on. by tend of the roundtable, i hope everyone watching has a good handle of what happened in politics that week and what to look for in the week ahead. ask me questions all week long on twitter and facebook. >>> that's all for us today. thank you for sharing part of your sunday tonight. check out "world news" with david muir tonight. and tune in wednesday night for special coverage the one-on-one the candidates debate. i'll see you tomorrow on "good morning america." ♪ [ male announcer ] how do you rn an entrepreneur's dream... ♪ into a scooter that talks to the cloud? ♪ or make 70,000 trades a second... ♪ reach one customer at a time? ♪ how do you help doctors turn billions of bytes of shared information... ♪ into a fifth annive